externc-libm 0.1.0

A port of `libm` that has all the required no_mangle and extern-cs for linking.
Documentation 
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// SPDX-License-Identifier: MIT
/*
 * File: src/math/ilogb.rs
 *
 * The ilogb function.
 *
 * Author: HTG-YT
 * Copyright (c) 2021 The LibM Team of the HaruxOS Project
 */

#[no_mangle]
pub extern "C" fn ilogb(x: f64) -> i32 {
    libm::ilogb(x)
}